<template>
    <div>
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <el-card>
            <el-alert :closable="false" show-icon
            title="注意:只允许为第三级分类设置相关参数!" type="warning"></el-alert>
            <el-row>
                <el-col class="ate_opt"><span>选择商品分类：</span></el-col>
                <el-col>
                <el-cascader
                    expand-trigger="hover"
                    v-model="cateSelectedKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange">
                </el-cascader>
                </el-col>
            </el-row>
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数按钮 -->
                    <el-button :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <el-table :data="manyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item,i) in scope.row.attr_vals"
                                :key="i" closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button @click="showEditDialog(scope.row.attr_id)" type="primary" size="mini" class="el-icon-edit">编辑</el-button>
                                <el-button @click="removeParams(scope.row.attr_id)" type="danger" size="mini" class="el-icon-edit">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 静态属性面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性按钮 -->
                    <el-button :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item,i) in scope.row.attr_vals"
                                :key="i" closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button @click="showEditDialog(scope.row.attr_id)" type="primary" size="mini" class="el-icon-edit">编辑</el-button>
                                <el-button @click="removeParams(scope.row.attr_id)" type="danger" size="mini" class="el-icon-edit">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 新增参数的对话框 -->
        <el-dialog
            :title="'添加'+titleText"
            :visible.sync="addDialogVisible"
            @close="addDialogClosed"
            width="50%">
            <el-form :model="addForm" 
                :rules="addFormRules" 
                ref="addFormRef" 
                label-width="80px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog
            :title="'修改'+titleText"
            :visible.sync="editDialogVisible"
            @close="editDialogClosed"
            width="50%">
            <el-form :model="editForm" 
                :rules="editFormRules" 
                ref="editFormRef" 
                label-width="80px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return{
            catelist:[],
            cateProps:{
                value:"cat_id",
                label:"cat_name"
            },
            cateSelectedKeys:[],
            activeName:"only",
            manyTableData:[],
            onlyTableData:[],
            addDialogVisible:false,
            addForm:{
                attr_name:""
            },
            addFormRules:{
                attr_name:[
                    {required:true, message:"请输入名称", trigger:"blur" }
                ]
            },
            editDialogVisible:false,
            // 修改的表单数据
            editForm:{},
            // 修改表单的验证规则
            editFormRules:{
                attr_name:[
                    { required: true, message: '请输入名称', trigger: 'blur' }
                ]
            },
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const { data: res } = await this.$http.get("categories")
            if(res.meta.status!==200)   return  this.$message.error("获取商品列表失败")
            this.catelist = res.data
        },
        async handleChange(){
            if(this.cateSelectedKeys.length!==3){ // 选中的不是三级分类
                this.cateSelectedKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 选中了三级分类
            // 根据所选分类id和当前所处面板 获取队形参数
            const { data:res } = await this.$http.get(
                `categories/${this.cateId}/attributes`, {
                    params: { sel: this.activeName }
                }
            )
            if(res.meta.status!==200)   return  this.$message.error("获取参数失败")
            console.log(res.data)
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : []
                item.inputVisible = false
                item.inputValue = ""

            });
            if(this.activeName==='many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }

        },
        // tab标签点击事件
        handleTabClick(){
            this.handleChange()
        },
        // 对话框关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid)  return
                const { data:res } = await this.$http.post(
                    `categories/${this.cateId}/attributes`,{
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName
                })
                if(res.meta.status!==201)   return this.$message.error("添加失败")
                this.addDialogVisible = false
                this.$message.success("添加成功")
                this.getCateList()
            })
        },
        async showEditDialog(attr_id){
            const { data:res } = await this.$http.get(
                `categories/${this.cateId}/attributes/${attr_id}`,{
                    params:{ attr_sel:this.activeName }
                })
            console.log(res.data)
            this.editForm = res.data;
            this.editDialogVisible = true
        },
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮修改参数
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid)  return
                const { data:res } = await this.$http.put(
                    `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                        attr_name:this.editForm.attr_name,attr_sel:this.activeName
                    })
                if(res.meta.status!==200)   return this.$message.error("获取参数数据失败")
                this.$message.success(`修改${this.titleText}数据成功`)
                this.editDialogVisible = false
                this.handleChange()
            })
        },
        // 根据id删除相应的参数
        async removeParams(attr_id){
            const confirmResult = await this.$confirm(
                "此操作将永久删除该参数，是否继续？",
                "提示",
                {
                    confirmButtonText:"确定",
                    cancelButtonText:"取消",
                    type:"warning"
                }
            ).catch(err=>err)
            if(confirmResult!=="confirm")   return thsi.$message.info("取消了删除")
            const { data:res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status!==200)   return this.$message.error("删除数据失败")
            this.$message.success("删除"+this.titleText+"数据成功")
            this.handleChange()
        },
         handleInputConfirm(row){
            // 新标签输入内容不合法
            if(row.inputValue.trim().length===0){
                row.inputValue = "",
                row.inputValue = false
                return
            }
            // 新增动态参数可选项
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ""
            row.inputVisible = false

            this.saveAttrVals(row)
        },
        // 点击按钮展示文本输入框
        showInput(row){
            console.log(row)
            row.inputVisible = true
            // $nextTick 页面重新渲染之后才会执行的回调函数
            this.$nextTick(_=>{
                this.$refs.saveTagInput.$refs.input.focus()
            })
        },
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        },
        async saveAttrVals(row){
            const { data:res } = await this.$http.put(
                `categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(" ")
            })
            if(res.meta.status!==200)   return this.$message.error("修改失败")
            this.$message.success("修改成功")
        }

    },
    computed:{
        // 如果按钮需要被禁用则返回true
        isBtnDisabled(){
            if(this.cateSelectedKeys.length!==3)    return true
            return false
        },
        cateId(){
            if(this.cateSelectedKeys.length===3)    
                return this.cateSelectedKeys[this.cateSelectedKeys.length-1]
            return nulll
        },
        titleText(){
            if(this.activeName==="many"){
                return "动态参数"
            }else{
                return "静态属性"
            }
        }
    }
}
</script>
<style scoped>
    .ate_opt{
        margin: 15px 0;
    }
    .el-tag{
        margin: 10px;
    }
    .input-new-tag{
        width: 120px;
    }
</style>